The addition of H2 to an Ar plasma studied by fast flow glow discharge mass spectrometry (FFGD-MS): mechanism and relative sensitivities

Computer simulations of argon–hydrogen Grimm-type glow discharges

“…In the last decade, there has been increasing interest in the effects of small admixtures of hydrogen to argon glow discharges used for mass spectrometry and optical emission spectrometry. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Hydrogen Balmer lines have been investigated in Ar-H 2 mixtures in a Grimm-type glow discharge by Konjevic and coworkers [1][2][3] to obtain information on reactions in the plasma, 1 on the electron density 2 and on the electric field distribution. 3 Mason et al 4,5 have studied the effect of H 2 on the ion intensities in a fast flowing glow discharge, with gas mixing close to the ion exit in order not to disturb the discharge.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Hydrogen Balmer lines have been investigated in Ar-H 2 mixtures in a Grimm-type glow discharge by Konjevic and coworkers [1][2][3] to obtain information on reactions in the plasma, 1 on the electron density 2 and on the electric field distribution. 3 Mason et al 4,5 have studied the effect of H 2 on the ion intensities in a fast flowing glow discharge, with gas mixing close to the ion exit in order not to disturb the discharge. Furthermore, it appears that the relative sensitivity factors (RSFs) of different elements in glow discharge mass spectrometry (GDMS) are influenced by the addition of H 2 .…”

Critical revision of GD-MS, LA-ICP-MS and SIMS as inorganic mass spectrometric techniques for direct solid analysis

“…119 The use of a fast flowing glow discharge ion source allows high current, power, and sputtering rate, increasing the intensity of the analytes and their ratio to the water-derived ions. 108,120 Moreover, the analytical potential of modulated radiofrequency GD-TOFMS provides a unique ''multi-dimensional'' analysis tool, allowing simultaneous elemental and molecular quantification, with low sensitivity (<ppm) and high depth resolution (below 5 nm) in conductive and non-conductive thin layers, for most of the elements of the periodic table. Although some investigations have been previously conducted using a pulsed dc-GD coupled to a TOF mass analyzer, 121,122 it has been observed that pulsed dc-GD considerably fragments the molecules, reducing the efficiency to obtain molecular information.…”

Glow Discharge Mass Spectrometry

“…[53][54][55][56][57] Moreover, due to the low residence time of the different species in the plasma region, this configuration was denominated ''fast flow'' source. Additional theoretical modelling studies supported the hypothesis that improved transport efficiency is achieved using the fast flow Grimm-type GD source, resulting in enhanced sensitivity and reduced number of polyatomic species.…”